package cn.yunhe.duotai;

public class DuoTaiDemo {

	public static void main(String[] args) {

		Teacher t = new Teacher();
//		t.say();
		
		Student s = new Student();
//		s.say();
		
		method(t);
		
	}

	public static void method(Person person){//person = new Student()
		person.say();
		
//		person.run();
	}
}
